Plate-valve ttstloader



Oct. 1923. 1,470,077

H. V. HAIGHT PLATE VALVE UNLOADER Filed June 19, 1922 Q q N Q .J I 1 R LL i H Q E 05 A L\ Y 17! c A E gvweufoz Eng 51257??- 3513 914 0fltto'vnegf Patented Oct. 9, 1923.

'UNITED STATES PATENT OFFICE-.-

HARRY VEBCOE HAIGHT, 0 1 SEIERBEOOKE, QUEBEC, CANADA, ASSIG'NOR TOINGER- SOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OFNEW JERSEY.

PLATE-VALVE UNLOADER.

Application filed June 19, 1922. Serial No. 569,473.

T 0 'll whom it may concern:

Be it known that l, HARRY V, HAIGHT, a citizen of the Dominion ofCanada, a resides t of Sherbroolte, Province of Quebec, Canada, haveinvented a certain Plate Valve Unloader, of which the following is aspecification accompanied by drawing.

device in such manner that in addition to automatic operatio niby fluidpressure, it may be conveniently operated by hand when l i I V i i (1Gi'QCl.

Theinvention is illustrated in one of its are'lerred forms in theaccomoan ino drawl l 3 ing, which is a sid elevation in longitudinalsect-ion of a plate valve unloader cmbodying the invention. j

Referring to the drawing, so much'ot platevalve is shown as will. serveto 1ndi-' inlet valve, but will not be further described." a its detailsform no part of the present invention, and" any suitable plate valve in,have my inventio applied thereto. 7

A valve cage G 'is located" over the valve seat A and is provided withthe arms H bearing on the valve seat and is also formed with anoperating cylinder J in which a piston is adapted to move. he piston maybe of any suitable construction, but 1 pro fer to construct the pistonwith a bot y por tion K having extensions or fiIlPQIS L adapted to bearupon the valve plate when required and hold the valve open. A pistonhead 0 extends into the body K and packing material P is arrangedbetween the head 0 and the body K so that the packing is always tight.lVhile this is a preferable construction, I am'not to be understood alimiting th invention to the type of piston shown,

lhe piston body K vent Q in its underportion and a spring R ispreferably located between the piston hody and a washer S on the stud Dfor retracting the forward.

A cover T is adapted to be secured to the compressor outer casing U inany suitable manner, as by means of the screws V and located oppositethe valve opening I) in the compressor cylinder wall F. The

upper portion of the valve cage G lies in the opening; U m thecompressor outer v T L L casing J, but does 11Gb touch the sldes ofpiston after it has been moved is provided with a l the opening, so thatthe cage and associated I parts may hereadily removed.

i suitable devicea's for instance, a se screw V threadedinto the'c'overT, cooperates with the valve cage G and bears upon the same to hold thecage in position on the valve seat A. Suitable means are provided forsupplying fluid pressure tothe operatiug'cylinder-J i the cage G, andfor this purpos 'Ipret'er' to supply the motive fluid through the inletconnection X and thence through the hollow bore Y of the set screw If tothe operating cylinder J Fluid pressure upon the piston head 0 willforce the piston and extensions or fingers L outwardly in a direction tomove the. valve plate. C away from its seat A. Release of pressure willpermit the retracting spring; R t move the piston in the oppositedirection and permit the valve to function in the usual way.

Means are also provided for manually actuatingthe piston in order tounload by hand and tor this purpose a rod Z extends through the .setscrew WV and is adapted to hear on the piston head 0. In order toforce-the unloading rod Z against the piston head, a internally screwthreaded cap a is provided at the outer end of the rod held upon theshoulder b by the washer c and pin (5. The cap a cooperates with thenter nally threaded connection 6 which is as show threaded to the outerend of the set screw WV,

A stop f on the rod Z limits the outward movement of the rod Z and thecap a, and

a spring 9! adapted to be compressed between th cap a and the connectione, aids in withdrawing the rod Z,

I claim:

1. A plate valve unloade-r comprising a plate valve including its seat,stop plate and stud adapted to lie in a valve opening in the cylinderwall of a compressor, a valve cage over the valve seat, the upperportion of the cage being adapted to lie freely in an opening in thecompressor cylinder cas- 1ng,w vhereb,y the cage may be readily removedfrom the casing, an operating cylinde'r in said cage and a piston insaid cylinder having fingers adapted to bear upon the 7 plat valve andhold it from its seat when desired, a spring interposed between thevalve stud and the piston a cover adapted 'to be secured to thecompressor outer casing opposite the said valve opening, a set screw inthe said cover cooperating with the valve cage to hold the cage inposition on the valve seat, means for supplying fluid pressure throughthe set screw t the said and stud adapted to lie in a valve opening inthe cylinder wall of a compressor, a valve cage over the valve seat, theupper portion of th cage being adapted to lie freely in an opening inthe compressor cylinder casing, whereby the cage may be readily removedfrom the casing, an operating cylinder in said cage and a piston in saidcylin der having fingers ada ted to bear upon the plate valve and ho dit from its seat when-desired, a spring interposed between th valve studand the piston, a cover adapted to be secured to the compressor outercasing opposite the said valve opening, a set screw in the said covercoopera ting with'the valve cage to hold the cage in position on thevalve seat, means for supplying fluid pressure through the set screw tothe said operating cylinder, a rod extending centrally through the setscrew and adapted to bear on said piston, and-manual means for forcingsaid rod longitudinally in order to actuate the piston and unload byhand.

3. A plate valve u-nloader comprising a plate valve and its seat, stopplate and stud adapted to lie i a valve opening in the cylinder Wall ofa compressor, a valve cage over the valve seat having an operatingcylinder, the upper portion of the cage being adapted to lie treely inan opening in the compressor cylinder casing, whereby the cage may bereadily removed from the cas- .ing, a piston in said cylinder consistingof a body portion having extensions adapted to hold the plate valve openwhen desired, a piston head on the body and a packing between the bodyand head, a cover in the compressor outer casing opposite the valveopening and means extending through the said cover for holding the cagein position and also for supplying fluid pressure to the said operatingcylinder.

In testimony whereof I have signed this specification.

HARRY VERCOE HAIGHT.

